Complex optical element and method for manufacturing thereof

Inactive Publication Date: 2005-04-21
FUJINON SANO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007] Accordingly, it is an object of the present invention to provide a lens-laminated composite optical element having a plastic lens portion laminated on a plane surface of a vitreous optical element, more particularly, a lens-laminated composite optical element whi

Problems solved by technology

However, in such a case, since individual optical elements are large in thickness, the optical system inevitably becomes large in size and weight.
However, integral molding of a plastic lens has problems in that a plastic lens portion is large in linear expansion co

Method used

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  • Complex optical element and method for manufacturing thereof
  • Complex optical element and method for manufacturing thereof
  • Complex optical element and method for manufacturing thereof

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Embodiment Construction

[0023] Hereafter, with reference to the accompanying drawings, the present invention is described more particularly by way of its preferred embodiments.

[0024] Referring to FIG. 1, there is shown a first embodiment of the present invention. In this first embodiment, a lens-laminated composite optical element is applied to an optical system of an optical disc pickup as schematically shown in FIG. 1. In FIG. 1, indicated at 1 is a first laser light source, and at 2 a second laser light source. A laser beam of 780 nm wavelength is projected from the first laser light source 1 to read information on a CD 3, while a laser beam of 650 nm wavelength is projected from the second laser light source 2 to read and write information on a DVD 4. The laser beams from the first and second laser light sources 1 and 2 are collimated through collimator lenses 5 and 6 and collimated light fluxes are converged toward CD 3 and DVD 4, respectively.

[0025] Indicated at 8 in FIG. 1 is a polarized prism, an...

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Abstract

A lens-laminated composite optical element composed of a vitreous optical element having a plane surface to perform inherent optical functions, and a thin and filmy transparent plastic lens portion molded in a curved lens profile and laminated on the plane surface of the vitreous optical element by the use of a mold.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Art [0002] This invention relates to a complex or composite optical element which basically has inherent optical functions as a prism, half mirror or reflector mirror, and more particularly to a lens-laminated composite optical element having a curved lens portion laminated on a plane surface of a vitreous optical element, either on a plane of incidence or a plane of emergence of light entrance of the vitreous optical element to provide complex or composite optical functions in an optical system. [0003] 2. Prior Art [0004] Optical pickup devices are widely in use for reading and writing information on optical discs or similar information recording media. In this connection, currently both CD (compact disc) and DVD (digital versatile disc) are in use as information recording or storage media, and attempts have been made to develop and put in use a CD / DVD drive which is capable of reading CDs and writing and reading DVDs, for example,...

Claims

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Application Information

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IPC IPC(8): B29C43/18B29L11/00G02B3/00G02B3/04G02B5/04G02B27/00G02B27/09G02B27/10
CPCB29C43/021B29C2043/3615B29L2011/0016G02B3/00G02B3/04G02B5/04G02B19/0028G02B27/095G02B27/1073G02B27/126G02B27/144G02B19/0052G02B27/0031
Inventor KOMIYA, KEIJIHIROSE, HATSUOYOKOYAMA, IWAOKURAHASHI, HAJIME
Owner FUJINON SANO
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